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use std::collections::HashMap;
use std::convert::Into;
use std::fmt::{self, Debug};
use std::iter::IntoIterator;
use std::ops::Index;
use std::str::FromStr;
use crate::headers::{
HeaderName, HeaderValues, IntoIter, Iter, IterMut, Names, ToHeaderValues, Values,
};
#[derive(Clone)]
pub struct Headers {
pub(crate) headers: HashMap<HeaderName, HeaderValues>,
}
impl Headers {
pub(crate) fn new() -> Self {
Self {
headers: HashMap::new(),
}
}
pub fn insert(
&mut self,
name: impl Into<HeaderName>,
values: impl ToHeaderValues,
) -> Option<HeaderValues> {
let name = name.into();
let values: HeaderValues = values.to_header_values().unwrap().collect();
self.headers.insert(name, values)
}
pub fn append(&mut self, name: impl Into<HeaderName>, values: impl ToHeaderValues) {
let name = name.into();
match self.get_mut(&name) {
Some(headers) => {
let mut values: HeaderValues = values.to_header_values().unwrap().collect();
headers.append(&mut values);
}
None => {
self.insert(name, values);
}
}
}
pub fn get(&self, name: impl Into<HeaderName>) -> Option<&HeaderValues> {
self.headers.get(&name.into())
}
pub fn get_mut(&mut self, name: impl Into<HeaderName>) -> Option<&mut HeaderValues> {
self.headers.get_mut(&name.into())
}
pub fn remove(&mut self, name: impl Into<HeaderName>) -> Option<HeaderValues> {
self.headers.remove(&name.into())
}
pub fn iter(&self) -> Iter<'_> {
Iter {
inner: self.headers.iter(),
}
}
pub fn iter_mut(&mut self) -> IterMut<'_> {
IterMut {
inner: self.headers.iter_mut(),
}
}
pub fn names(&self) -> Names<'_> {
Names {
inner: self.headers.keys(),
}
}
pub fn values(&self) -> Values<'_> {
Values::new(self.headers.values())
}
}
impl Index<HeaderName> for Headers {
type Output = HeaderValues;
#[inline]
fn index(&self, name: HeaderName) -> &HeaderValues {
self.get(name).expect("no entry found for name")
}
}
impl Index<&str> for Headers {
type Output = HeaderValues;
#[inline]
fn index(&self, name: &str) -> &HeaderValues {
let name = HeaderName::from_str(name).expect("string slice needs to be valid ASCII");
self.get(name).expect("no entry found for name")
}
}
impl IntoIterator for Headers {
type Item = (HeaderName, HeaderValues);
type IntoIter = IntoIter;
#[inline]
fn into_iter(self) -> Self::IntoIter {
IntoIter {
inner: self.headers.into_iter(),
}
}
}
impl<'a> IntoIterator for &'a Headers {
type Item = (&'a HeaderName, &'a HeaderValues);
type IntoIter = Iter<'a>;
#[inline]
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
impl<'a> IntoIterator for &'a mut Headers {
type Item = (&'a HeaderName, &'a mut HeaderValues);
type IntoIter = IterMut<'a>;
#[inline]
fn into_iter(self) -> Self::IntoIter {
self.iter_mut()
}
}
impl Debug for Headers {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_map().entries(self.headers.iter()).finish()
}
}
impl AsRef<Headers> for Headers {
fn as_ref(&self) -> &Headers {
self
}
}
impl AsMut<Headers> for Headers {
fn as_mut(&mut self) -> &mut Headers {
self
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::str::FromStr;
const STATIC_HEADER: HeaderName = HeaderName::from_lowercase_str("hello");
#[test]
fn test_header_name_static_non_static() -> crate::Result<()> {
let static_header = HeaderName::from_lowercase_str("hello");
let non_static_header = HeaderName::from_str("hello")?;
let mut headers = Headers::new();
headers.append(STATIC_HEADER, "foo0");
headers.append(static_header.clone(), "foo1");
headers.append(non_static_header.clone(), "foo2");
assert_eq!(headers[STATIC_HEADER], ["foo0", "foo1", "foo2",][..]);
assert_eq!(headers[static_header], ["foo0", "foo1", "foo2",][..]);
assert_eq!(headers[non_static_header], ["foo0", "foo1", "foo2",][..]);
Ok(())
}
#[test]
fn index_into_headers() {
let mut headers = Headers::new();
headers.insert("hello", "foo0");
assert_eq!(headers["hello"], "foo0");
assert_eq!(headers.get("hello").unwrap(), "foo0");
}
#[test]
fn test_debug_single() {
let mut headers = Headers::new();
headers.insert("single", "foo0");
assert_eq!(format!("{:?}", headers), r#"{"single": "foo0"}"#);
}
#[test]
fn test_debug_multiple() {
let mut headers = Headers::new();
headers.append("multi", "foo0");
headers.append("multi", "foo1");
assert_eq!(format!("{:?}", headers), r#"{"multi": ["foo0", "foo1"]}"#);
}
}